Long Mott Energy, LLC – Long Mott Generating Station Xe-100 Power Reactor Application
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Who: |
Long Mott Energy, LLC |
What: |
Application for a construction permit for an advanced power reactor |
When: |
March 31, 2025 (date of application submittal) |
Where: |
Calhoun County, Texas |
Website: |
https://x-energy.com/reactors/xe-100 |
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On this page:
Project Overview
The staff of the U.S. Nuclear Regulatory Commission (NRC) is currently engaged in review activities for the construction permit application from Long Mott Energy, LLC (LME), for the Xe-100 power reactor to be located in Calhoun County, Texas. The Xe-100 project is supported by the U.S. Department of Energy’s Advanced Reactor Demonstration program and would be used to demonstrate the X Energy Xe-100 reactor technology.
Plant Characteristics |
Description |
Reactor Type |
High-Temperature Gas-Cooled Reactor (HTGR) |
Containment Type |
Functional Containment: Uranium Oxy carbide (UCO) fuel kernel, TRIstructural ISOtropic (TRISO) particle fuel layers, Fuel matrix, Helium pressure boundary, (see SECY-18-0096 for a description of functional containment) |
Power Level |
4-pack plant with 800 MWth/320 MWe |
Fuel |
Graphite Pebbles with TRISO Particle fuel |
Balance of Plant |
Shared steam powered conversion system (Rankine Cycle) |
Key Milestones
Milestones |
Completion Date
Actual - A
Target - T |
Application Tendered |
03/31/2025 |
Acceptance Review |
Acceptance Review Start |
04/01/2025 – T |
Docketing Decision Letter
Issued/Acceptance Review Complete |
05/30/2025 – T |
Review Schedule Established/Schedule Letter Issued to Applicant |
TBD |
Safety Review* |
TBD |
Environmental Review* |
TBD |
Hearing |
TBD |
Construction Permit Decision |
TBD |
* The schedule of the key milestones for the safety and environmental reviews will be published once the acceptance review of the construction permit application is completed, and the NRC staff determines if the application can be accepted and docketed for detailed technical review.
Contacts for Long Mott Generating Station Xe-100 Power Reactor |
Safety Project Managers |
Adrian Muñiz
301-415-4093 |
Environmental Project Managers |
Joe O’Hara
301-415-6854 |
Public Affairs Officer |
Scott Burnell
301-415-8204 |